test(autoware_geography_utils): add lanelet2_projector test

[youtalk]

Description

This adds lanelet2_projector test.

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Interface changes

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Effects on system behavior

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[codecov]

Codecov Report

Attention: Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 79.18%. Comparing base (051d227) to head (6c78597).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...e_geography_utils/test/test_lanelet2_projector.cpp	84.00%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
+ Coverage   73.25%   79.18%   +5.93%     
==========================================
  Files          10       11       +1     
  Lines         172      197      +25     
  Branches       68       75       +7     
==========================================
+ Hits          126      156      +30     
+ Misses         19       11       -8     
- Partials       27       30       +3     

Flag	Coverage Δ		*Carryforward flag
differential	83.33% <84.00%> (?)
total	73.25% <ø> (ø)		Carriedforward from 051d227

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[SakodaShintaro]

From my understanding, get_lanelet2_projector is used in project_forward

autoware.core/common/autoware_geography_utils/src/projection.cpp

Line 36 in 09d77e4

std::unique_ptr<lanelet::Projector> projector = get_lanelet2_projector(projector_info);

and project_forward is already tested in

autoware.core/common/autoware_geography_utils/test/test_projection.cpp

Line 44 in 09d77e4

autoware::geography_utils::project_forward(geo_point, projector_info);

So, to some extent, get_lanelet2_projector is indirectly tested.

However, it is still okay to test it explicitly.

[youtalk]

Since it is a unit test, I believe it is best to write tests for each smallest unit.